And an imaginary one, at least so far. If the only barrier to gun regulation was that vanishingly small and largely Texan minority of dumbasses, this issue would have been settled long ago. Count your blessings - taken seriously by a strict constructionist, it would establish the right to carry top of the line military grade firearms, as a well-regulated (that is, well equipped and in good order) militia would carry. The enshrinement of the right was a protection from an overreaching government - the arms themselves were for protection from brigands and highwaymen and frontier raiders and hostile neighbors of wilderness dwellings. Or home invasion, organized gangs, livestock thieves, illegal drug gardeners, etc - not that far from the frontier problems. Of course we can - almost nobody opposes sane gun regulation, and it's perfectly Constitutional.